It's suppose to change the Alert Color and not the Service Type. I'll look at this before the next release.
If every Service Type was deleted besides Aircraft then the "Find All" box was probably checked.
Yes, I had "Find All" checked. It would be great to be able to change the Alert Settings (color/on/fast/slow) based on Service Types using the same type of interface Proscan uses for the "Set Activity Display Back Color by Service Type" Option in the Scanner Specific Options. That interface works well, but it doesn't allow copying the revised settings back to the scanner. Thanks for the quick response and for developing this incredible software.